Sony TRINITRON KD-34XBR2 Service Manual page 8

To Bring Up Screen Test
In standby mode, press buttons on the Remote Commander
sequentially, in rapid succession, as shown below:
Channel 5
DISPLAY
Handling of Self-Diagnostic Screen Display
Since the diagnostic results displayed on the screen are not
automatically cleared, always check the self-diagnostic screen
during repairs. When you have completed the repairs, clear the
result display to "0". Unless the result display is cleared to "0", the
self-diagnostic function will not be able to detect subsequent faults after completion of the repairs.
Clearing the Result Display
To clear the result display to "0", press buttons on the Remote Commander sequentially when the diagnostic screen is displayed, as shown below:
Channel 8
ENTER
Quitting the Self-Diagnostic Screen
To quit the entire self-diagnostic screen, turn off the power switch on the Remote Commander or the main unit.
Self-Diagnostic Circuit
.
White Balance Failure
If the RGB levels* do not balance within 2 seconds after the power is turned on, this error will be detected by IC201. TV will stay on, but there
will be no picture.
*(Refers to the RGB levels of the AKB detection Ref pulse that detects 1K).
Low B OCP/OVP
Occurs when set 5V is out.
Horizontal Defl ection Stopped
Occurs when either: 1) a +B overcurrent is detected (IC5007), or 2) overheating is detected (Thermistor TH5002).
Sound volume - Power ON.
.
SELF DIAGNOSIS
2: +B OCP
3: +B OVP
4: VSTOP
5: AKB
6: LOWB
7: H-STOP
— 8 —
N/A
N/A
Numeral "0" means that no fault
0
was detected.
1
Numeral "1" means a fault was
detected one time only.
0
0
+B overcurrent (OCP)
Occurs when an overcurrent (more
than 6A) on the +B (135V) line
is detected by R6598/R6591. It will
cause Q6520 to turn on and force the
AC relay to turn off through Q6532
and Q6530.
+B overvoltage (OVP)
Occurs when 1) overvoltage (more
than +140V) on the +B (135V) line
is detected by IC6505, or 2) an
overvoltage (more than 7.5 V) on the
unreg 7V line is detected by D6014.
The AC relay will turn off through
Q6532 and Q6530.
Vertical Defl ection Stopped
Occurs when an absence of the
Vertical defl ection pulse is detected by
IC201. Power supply will shut down
when waveform interval exceeds 2
seconds.
KD-34XBR2